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Ridgway's Hawk Buteo ridgwayi

  • Order: Accipitriformes
  • Family: Accipitridae
  • Monotypic
  • Authors: David L. Anderson, Russell Thorstrom, Christine D. Hayes, and Thomas Hayes
Sections

Breeding

Territorial flights begin in January to February, with nest construction in February to March (Wiley and Wiley 1981). Nests have been observed in 20 species of living trees (Thorstrom et al. 2007, Woolaver et al. 2014), but over 75% are built in royal palm (Roystonea borinquena; Thorstrom et al. 2007, Woolaver et al. 2014), nearly always on top of the colonial nests of Palmchat (Dulus dominicus), or else on epiphyte clusters when nesting in trees, and less frequently on bare branches (Wiley and Wiley 1981). Nests are loose stick platforms. Eggs are chalky cream, marked with reddish-brown flecks (T. Hayes, unpublished photographs). The mean laying date for a first clutch is mid-February (Woolaver et al. 2014), and pairs will re-nest up to two times after nest failure. The length of incubation ranges from 33 to 37 days, with asynchronous hatching. Both sexes incubate (Wiley and Wiley 1981). Nestlings fledge in mid-April to May for first nest attempts, and as late as July for third nest attempts (Thorstrom 2007). Clutch size ranges from 1 to 3, with a modal clutch size of 2 (Woolaver et al. 2014). Mean productivity per successful nest attempt (2002-2005, 138 breeding attempts) is 1.6 young produced, and mean nest success is 34% (range 22-68%; Thorstrom et al. 2007).

Recommended Citation

Anderson, D. L., R. Thorstrom, C. D. Hayes, and T. Hayes (2017). Ridgway's Hawk (Buteo ridgwayi), version 1.0. In Neotropical Birds Online (T. S. Schulenberg, Editor). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/nb.ridhaw1.01